stainless steel

noun
alloy steel containing 12 percent or more chromium, so as to be resistant to rust and attack from various chemicals.
Also called stainless.


Origin:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
stainless steel
 
n
a.  a type of steel resistant to corrosion as a result of the presence of large amounts of chromium (12--15 per cent). The carbon content depends on the application, being 0.2--0.4 per cent for steel used in cutlery, etc, and about 1 per cent for use in scalpels and razor blades
 b.  (as modifier): stainless-steel cutlery

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

stainless steel
1917, a chromium-steel alloy (usually 14% chormium) used for cutlery, etc., so called because it is highly resistant to rust or tarnish.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
stainless steel   (stān'lĭs)  Pronunciation Key 
Any of various alloys of iron that contain chromium, nickel, and small amounts of carbon. They may also contain minor amounts of other elements, such as molybdenum. Stainless steel is resistant to rusting and corrosion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Both are plastic outside but have stainless steel inside.
The group have also used their machine to punch holes in hardened steel,
  including stainless steel.
My fantasy football is made out of brushed stainless steel.
Here, dark-wood surfaces and stainless steel appliances do the trick.
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